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package aoc2023; | |
import java.io.IOException; | |
import java.nio.file.Files; | |
import java.nio.file.Path; | |
import java.util.Map; | |
public class Day1 { | |
public static void main(String[] args) throws Exception | |
{ | |
part1(); | |
part2(); | |
} | |
private static void part1() throws IOException { | |
int sum = Files | |
.readAllLines(Path.of("input1.txt")) | |
.stream() | |
.map(s -> s.replaceAll("\\D+","")) | |
.mapToInt(s -> Integer.parseInt(s.charAt(0)+""+s.charAt(s.length()-1))) | |
.sum(); | |
System.out.println(sum); | |
} | |
static Map<String, String> numbers = Map.of( | |
"one", "1", | |
"two", "2", | |
"three", "3", | |
"four", "4", | |
"five", "5", | |
"six", "6", | |
"seven", "7", | |
"eight", "8", | |
"nine", "9" | |
) ; | |
private static String extractNumbers(String in) | |
{ | |
String out = ""; | |
for (int i = 0; i < in.length(); i++) | |
if(Character.isDigit(in.charAt(i))) | |
out+=in.charAt(i); | |
else | |
for (var e : numbers.entrySet()) | |
if(in.indexOf(e.getKey(), i) == i) | |
out+=e.getValue(); | |
return out; | |
} | |
private static void part2() throws IOException { | |
int sum = Files | |
.readAllLines(Path.of("input1.txt")) | |
.stream() | |
.map(Day1::extractNumbers) | |
.mapToInt(s -> Integer.parseInt(s.charAt(0)+""+s.charAt(s.length()-1))) | |
.sum(); | |
System.out.println(sum); | |
} | |
} |
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